Agreed on the MDPV.
It's unfortunate, because the first two days or so of using the "Peeve" can be amazing. If it wasn't so incredibly addictive that it quickly brings you to a place where you're hallucinating and paranoid out of your mind, I would say it was my favorite stimulant, and that's not a light statement coming from me. MDPV initially has everything going for it. I inject, so the rush is really intense (though not quite as crazy as cocaine-but what is?), and the high feels like a slightly psychadelic amphetamine buzz, where I feel super loving, sociable and motivated (none of which are my actual personality traits.) Also the duration is really long so you have a nice long high, but at the same time, this is where the problem lies IMO, in regards to MDPV. For those of us who shoot, or smoke it (the most "fiendish" ROA's), there is an incredible urge to keep redosing.
The first time I tried MDPV, I knew little about it. I was given about 150mg, and started off shooting 4mg (which got me insanely spun). I then smoked and shot the remaining 145mg within the next 36 hours, sometimes doing shots once an hour or less. The turnout of this was that I couldn't speak (I could move my mouth and tongue, but couldn't provide more of a sound than a whisper), my veins were trashed, I was no longer getting euphoria frm the substance, and I began to become delirious.
Since then I learned to use it slightly more responsibly (no more than 3x a day, low dosages etc), but I still don't try and get it anymore. I just can't use that drug safely.
The two days I spent with Mephedrone were wonderful. It's addictive too, but nothing like MDPV. I really like the rush (very important to me), as well as the high, which is stimulating and social. I'd choose this substance over MDPV, as I could definately put it down before things got too bleak.